15 reactions | In order to help with adjusting your K400 shoulder holster, we put together this little video. Just chose your size then see the length we recommend and base your adjustments off of that. We encourage everyone to adjust to what they deem comfortable, and once you find what works for you, put a little bit of loctite on the screws to make sure they don't slowly back out on you. | Kirkpatrick Leather Company | Facebook

The Spring-Mass Model and Ground Reaction Force Vector of Running Modelling is used in science in an attempt to make an activity easier to understand, define, quantify, visualize, or simulate by referencing it to existing and usually commonly accepted knowledge. For human running, the preferred model within the international biomechanics community for the past quarter-century is the Spring-Mass Model (Blickhan R: The spring-model for running and hopping. J Biomech, 22(11/12):1217-1227, 1989). In